Recent content by tigerlili

i actually solved this problem the key lies in a formula that was quite difficult to find at first, but quite simple to use afterwards c1/d1 = c2/d2, where the different concentrations and densities are due to the temperature difference after that, the buoyancy correction equation is used...

it said 1.000 M KNO3. sorry for not specifying.. i was really tired when i typed it out. i don't know either of these things that you mention. This is only my 2nd day in analytical chem, and this question was given to me as an assignment. i also think the question is unclear.. but, obviously...

Homework Statement you want to prepare 500 ml of 1 M KNO3 at 20 C, but your lab and water are 24 C. How many grams of solid KNO3 (density= 2.109 g/ml) should be dissolved in a volume of 500 ml at 24 C so that the concentration will be 1 M at 20 C? what apparent mass of KNO3 weighed in air is...

okay, thanks for your help :)

Homework Statement At 318 K and 1.04 x 10-2 atm, the density of a gas is 1.75 x 10-5 g/cm3. (a) Find vrms for the gas molecules. (b) Find the molar mass of the gas. Homework Equations vrms= sqrt (3RT/M) pV=nRT pM=dRT pV=(m/M)RT The Attempt at a Solution the main problem i...

thanks for your help, i actually got it :)

Homework Statement The thin uniform rod in Fig. 10-52 has length 4.0 m and can pivot about a horizontal, frictionless pin through one end. It is released from rest at angle θ = 40° above the horizontal. Use the principle of conservation of energy to determine the angular speed of the rod as...

i know you're right, I've just been so overwhelmed by this class lately i think i understand it now, thanks for your help :)

okay, i think i got it thanks for your help

haha wow.. sorry about that the vector notation didn't actually paste properly and i really don't remember even learning the equation for a stretched spring, I'm just so lost it no longer really matters, because the homework was already due i just want to understand what's going on in the...

i actually just got it, thanks for your help!

Homework Statement A 1.8 kg block is initially at rest on a horizontal frictionless surface when a horizontal force in the positive direction of an x-axis is applied to the block. The force is given by F(x) = (7.6 - x2) N, where x is in meters and the initial position of the block is x = 0...

Homework Statement A force of 4.7 N acts on a 17 kg body initially at rest. Compute the work done by the force in (a) the first, (b) the second, and (c) the third seconds and (d) the instantaneous power due to the force at the end of the third second. Homework Equations f= ma p=fv...

oh, woops! i forgot to paste the rest :X The scale of the figure's vertical axis is set by Ks= 8.0 J. (a) What is the magnitude of ? (b) What is the value of k? sorry about that!

Homework Statement a block of mass m lies on a horizontal frictionless surface and is attached to one end of a horizontal spring (spring constant k) whose other end is fixed. The block is initially at rest at the position where the spring is unstretched (x = 0) when a constant horizontal force...